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Why unresolved externals? (C++)

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I cannot compile my game anymore. It only happens in release build, not debug and I cannot figure it out. I have cleaned and recompiled the project. The function in question is only mensioned in three lines: C:\Dropbox\PROJECT\code\epaengine\gameController.cpp(15):bool gameController::CheckConnection(std::vector<bool> & occupiedPorts) C:\Dropbox\PROJECT\code\epaengine\gameController.cpp(40): CheckConnection(occupiedPorts); C:\Dropbox\PROJECT\code\epaengine\gameController.h(46): bool CheckConnection(std::vector<bool> & occupiedPorts); Matching lines: 3 Matching files: 2 Total files searched: 59 This is the build error: Error 3 error LNK2019: unresolved external symbol _XInputGetState@8 referenced in function "public: bool __thiscall gameController::CheckConnection(class std::vector<bool,class std::allocator<bool> > &)" (?CheckConnection@gameController@@QAE_NAAV?$vector@_NV?$allocator@_N@std@@@std@@@Z) C:\Dropbox\PROJECT\code\games\post\source\gameController.obj zombies What can be wrong here? Thank you Erik

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